[4] Lande D, Oriov S S, Akella A, et al. Digital holographicstorage system incorporating optical fixing [J]. Opt. Lett., 1997, 22: 1722-1724.

[5] Lin H, Pun E, Man S, et al. Optical transitions and frequency upconversion of Er3+ ions in Na2O-Ca3Al2-Ge3O12 glasses [J]. J. Opt. Soc. Am. B, 2001, 18: 602-609.

[6] Collins S F, Baxter G W, Wade S A, et al. Comparison of fluorescence-based temperature sensor schemes: Theoretical analysis and experimental validation [J]. J. Appl. Phys., 1998, 80: 46-49.

[7] Tsuda M, Sousa K, Inoue H, et al. Effect of Yb3+ doping on upconversion emission intensity and mechanism in Er3+/Yb3+ -codoped fluorozirconate glasses under 800 nm excitation [J]. J. Appl. Phys., 1999, 86: 6143-6149.

[8] Jin Z, Nie Q H, Xu T F, et al. Optical transitions and upconversion luminescence of Er3+/Yb3+ codoped lead–zinc–tellurite oxide glass [J]. Materials Chemistry and Physics, 2007, 104: 62-67.

[9] Dos Santos P V, Gouveia E A, De Araújo M T, et al. Thermally induced threefold upconversion emission enhancement in nonresonant excited Er3+/Yb3+ -codoped chalcogenide glass [J]. Appl. Phys. Lett., 1999, 74: 3607-3609.

[10] Layne C B, Lowdermilk H W, Weber M J. Multiphonon relaxation of rare-earth ions in oxide glasses [J]. Phys. Rev. B, 1977, 16: 10-20.

[11] Reisfeld R. Spectroscopy and nonradiative phenomena of rare earths in glasses: Future applications [J]. Inorg. Chim. Acta, 1984, 95: 69-74.

[12] Maurice E, Monnom G, Saissy A, et al. Thermalization effects between upper levels of green fluoresence in Er-doped silica fibers [J]. Opt. Lett., 1994, 19: 990-992.

[13] Da Silva C J, De Araujo M T, Gouveia E A, et al. Thermal effect on multiphonon-assisted anti-Stokes excited upconversion fluorescence emission in Yb3+-sensitized Er3+-doped optical fiber [J]. Appl. Phys. B, 2000, 70: 185-188.

[14] Shinn M D, Sibley W A, Drexhage M G, et al. Optical transitions of Er3+ ions in fluorozirconate glass [J]. Phys. Rev. B, 1983, 27: 6635-6648.

[15] Cai Z P, Xu H Y. Point temperature sensor based on green upconversion emission in an Er:ZBLALiP microsphere [J]. Sensors and Actuators A, 2003, 108: 187-192.

[16] Judd R. Optical absorption intensities of rare earth ions [J]. Phys. Rev., 1962, 127: 750-761.

[17] Ofelt G S. Intensity of crystal spectra of rare-earth ions [J]. J. Chem. Phys., 1962, 37: 511-520.

[18] Riseberg L A, Caspers W H, Rast H E. Lattice vibrations of yttrium vanadate [J]. Phys. Rev., 1968, 168: 964-969.

[19] Stanworth J E. Tellurite glasses [J]. Nature, 1952, 169: 581-582.

[20] Lonoue H, Soga K, Makishima A. Simulation of the optical properties of Er: ZBLAN glass [J]. J. Non-Cryst. Solids, 2002, 298: 270-286.

[21] Cruz G K, Carvalho R A, Basso H C. Energy assignments for the 4I15/2 and 4S3/2 multiplets of the Er3+ ion in (Er0.05Y0.95)2BaZnO5 [J]. J. Appl. Phys., 2001, 89: 2194-2201.

[22] Rai V K, Rai S B. Temperature sensing behaviour of the stark sublevels [J]. Spectrochimica Acta Part A, 2007, 68: 1406-1409.